What is "murmurhash"

MurmurHash is a non- cryptographic hash function suitable for general hash-based lookup. It was created by Austin Appleby in 2008 and is currently hosted on Github at https://github.com/aappleby/smhasher along with its test suite named 'SMHasher'. It also exists in a number of variants, all of which have been released into the public domain. The name comes from two basic operations, multiply (MU) and rotate (R), used in its inner loop.

Unlike cryptographic hash functions, it is not specifically designed to be difficult to reverse by an adversary, making it unsuitable for cryptographic purposes.